ASTM F2170 Testing
ASTM F2170 is the industry-standard test method for measuring relative humidity (RH) inside concrete floor slabs using in-situ probes. It is the most accurate and reliable method for determining whether a concrete slab is dry enough for flooring installation. Most flooring manufacturers require F2170 test results before honoring their warranties.
Key Takeaways
- ASTM F2170 measures relative humidity inside the concrete slab at 40% depth (for slabs drying from one side)
- Sensors are installed in drilled holes and sealed for 24 hours before reading
- Most flooring manufacturers require RH levels below 75-85% (varies by product)
- F2170 is more accurate than surface-based tests because it measures internal slab conditions
- A certified inspector follows strict protocols for hole depth, sensor placement, and equilibration time
Frequently Asked Questions
Most flooring manufacturers require ASTM F2170 and/or F1869 test results before honoring warranties. Installing over an untested slab is the leading cause of flooring failure.
ASTM F2170 requires 24 hours of equilibration after sensor installation. ASTM F1869 requires 60-72 hours. Plan accordingly before scheduling installation.
About the Author
Independent flooring inspector serving Southern California. Certified as NWFA Certified Inspector (#CP2416122), FCITS Master Inspector (#2031), NALFA Inspector, IFCII Inspector, and CFI University graduate. Specializes in forensic flooring investigations, moisture diagnostics, insurance claims, and expert witness services.
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